import java.util.Scanner;

/**
 * Created with IntelliJ IDEA.
 * User: wenxiwen
 * Date: 2022/3/11
 * Time: 9:53
 * Description: No Description
 */
public class TestDemo {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int a = scan.nextInt();
        if(a%4==0 && a%100!=0 || a%400 == 0) {
            System.out.println("是润年");
        } else {
            System.out.println("不是闰年");
        }
    }
    public static void main6(String[] args) {
        Scanner scan = new Scanner(System.in);
        int a = scan.nextInt();
        if(a > 0) {
            System.out.println("正数");
        } else if(a < 0) {
            System.out.println("负数");
        } else {
            System.out.println("为0");
        }
    }
    public static void main5(String[] args) {
        Scanner scan=new Scanner(System.in);
        int a=scan.nextInt();
        if(a >=90 && a <= 100) {
            System.out.println("优秀");
        } else if(a >= 80 && a < 90) {
            System.out.println("良好");
        } else if(a>=70 && a <80) {
            System.out.println("中等");
        } else if(a>=60 && a<70) {
            System.out.println("及格");
        } else if(a<60 && a>=0) {
            System.out.println("不及格");
        } else {
            System.out.println("输出错误");
        }
    }
    public static void main4(String[] args) {
        Scanner scan=new Scanner(System.in);
        int a=scan.nextInt();
        if(a%2==0) {
            System.out.println("偶数");
        } else {
            System.out.println("奇数");
        }
    }
    public static void main3(String[] args) {
        System.out.println(0b0011_0011_0011_0011);
    }
    public static void main2(String[] args) {
        int a=30;
        System.out.println(a<10);
    }
    public static void main1(String[] args) {
        String[] str=new String[3];
        str[0]="welcone to Core Java";
        str[1]="by Cay Horstmann";
        str[2]="and Gary Cornell";

        for(String h: str) {
            System.out.println(str);
        }
    }
}